Process of manufacturing boring or milling cutters.



3510f 848,112; PATENATED MAR. 26, 1907.

. J. G. MATTHEWS. I PROCESS OF MANUFACTURING BORING 0R MILLING GUTTERS.

. APPLIUATION FILED JUNE 22,1904.

2 SHEETSSHBET 1.

' PATENTED MAR. 26, 1907.

. J. G. MATTHEWS. PROCESS OF MANUFACTURING BORING 0R MILLING GUTTERS.

APPLIGATION'PILED mm: 22,1904.

' 2 SHBEiS-S-HEBT 2.

Cutters of. the following isa specificaf .i

BATEnT oFFron,

' JOHN F "TlIR EE RIVERS,- MICHIGAN! P E$$1F M NQEWTUB N Bea s. R NG CUTT To all whom it may conaerm- Be'it known hat 1; JOHN .G.MATrI'1EWs, .a" citlzen of theUnited States-residing at thecity of Three Rivers; in-the county of St., Joseph and State of Michigan ,have invented certain new; and useful Improvements in Processes of Manufacturing Boring ofiMilling This invent 1,0 relates to an improved proeesfs 'of nija'nu'fa uringjboring orlmilling vvide ani impr'o Themainohje ofthis invention an)" proboring or millirlig eutters..' y

Further objects will definitely- I .the'detaileddescription'to followf; Y

I I by the devices and mansidg outin-theclaimst g I I I I A structure -embody'ing{the-features of my a 1 inventlonandshovvin the stepsof thepr'ooess' 5. trated in theaccompanying drawing, forni- "111% a part of this specification, in Whichl'accomplishitheobje tsdoffmj vention' I scribed. in the. followingspecification; 1 n? T' The invention is clearlyld fined-and pointed or methodofmam acture is. clearly .illus res 1 and 2 show. an end and side view of the steel shank or body ofja reamerin the first'step of my process 'of manufacture. Figs/.3 and 4 show aendandjside view of the s'aixie'in the second stepof the process of Figs; 11; I process,

' q I manufacture, in which flutes-j are cut into thehea'ds Figs. -,5' andfi show-anfend'and i35 I process of 'manufacture, 1'1I1 iwhlchthe seats are 'cutlfo'rfth'e cutthrg-blades ofthe-highsid'e view'of'tlfe'shank in thenext step of the grade steel. .jFigs 7andj-8 are Iend'and side elevation views of the neXt step of the manufacturein which the ,said bladesare-inserted in their seats 1itted closely, and showing the I 'meansg 'of-retaininjgthe sairre;. elo s'e" wlthin their seats, Figsil'ari'd 10 r t are Views I Showin-g thenext step f the 'processfin which the blades are bound fsecurely 1 in position with:

vvrapping wires-, as B 13', around the same. and ;1=2=show' the nextstep of;,the;

accomplished; Figs-1 13 and 14 show end. and side" elevation iviews of the. structureafter the-iwrapping-wires have been removed and the flux cleaned ofl. Figs. 15 and 16 vedl process of I manufacturing I beingendla'nd. side elevation views after'the brazing and hardeningthave been show end and side elevations of the struc- 1 cut; away condition.

tirely cut away blades.

views, I

in the modified form the drawings.

flut'es a in this. head or shank; but this stepof posure'of the blades for hardening The third step consists 1n forming longi fceive the blades. of high speedsteel and is high-speed steel; position, and-secur'i g ing in a vise or other means.

describing my "invention I will-"first I point out and indicate the'difl'erentfs'teps of the process of manufacture and then describe the completed'tooliin the'form preferred and in which it appears'jin I 'tudin'al seats a inthis head or shank to rethem thereby indenting. the metal forming the adjacent front wall in a series .o;light"'-in dentations by means of a punch'and forcingthe blades into the bottom of the "slots 'after I such indentations have been fornied'by-p1ac Theseindenta- I Specification o f'Lette'rs Patent. I 'ratented March 26, 1 907.. I i T I Application filed June 22, 1904. Serial No. 213,718.

peripheries of the-blades. Figs. 17 and 18 I ;show end and side elevation views of the I reamer; in which the flutes are ground outL and the "r'ro'ntsides of the bla'd-s are formed and the'shank or'body is in its finished-condition. Figs.'1 9 and20 show-ztherearner'with the peripheries of the blades ground to'a' true circle and (to the propersizj e for the re'amer. vvFigs .21'a1'1d-22.show the points ofthe blades v I for clearanceand .the backs of the bladesfrelievedandthe-toolin its finishedf v Figs 23'. and 24 show another form of :aIfinished four-blade. rea'mergo'r bor 'ing-tool in which" the st ck of the body .isferb v from the trent 'ofthecutting- In the d'ravv-in g similar letters 'ofreference refer to similar parts throughout the several 7 To 4 properly, produce ,my

or milling tool, I first turn a simple plain A, to substantially the size'require'd,

' -j'1 he-next step of the process l-prefertoicut a .the process might be'o nitted or comelater I am giving the-process as preferred by-me as", I proceed and will indicatefany variations:

. 19 This cutting of the flutes-insures proper 'exf,

d 8' Show the step-"of Ithe process. i

rm? I tionsshave the effect, of forcing 1 I retainingewires around it the wires will bemg-wires will not berequiied at all and that ends of the blades first of the blades, leaving the reamer-as'seen in the steel to'be hardened, the retaining- 1? igs. 9 and 10 show the step of the process I WhlCll consists in' placing retaining-wires 5' around the tool to retain the blades securely dening operation, a pair of wires B being illussuflicient, and oftentimes several are employed. v Figs. 11 and 12 show the sixth step of the process. After the tool has been heatedto the proper point for hardening the steel and the whole has been treated with a proper flux and solder or spelter it is cooled bya proper method to secure the hardening of the steel and the setting of the spelter or solder to' form a bond between the blades and the ead. By pursuing this method-it will be noted that when the tool is heated with the come expanded, sd that they do not serveto retainv the blades very securely during the heating and brazing'process; but when the tool is cooled, either by air-blast or by im- Inersing in oilor otherwise appropriate to wires B will be cooledfirs't. and will conse quently sharply contract and force the blades to thebottom of their seats before the spelter sets, thus retaining the blades in the I best possible manner for their successful use thereafter, and this is accomplished no matter how the cooling is done. It is preferred to cool both ends of the blade first, as by that means they will beretained properly in position until the spelter is entirely set and the blade is thus prevented from warping. While these retaining-wires will be observed to serve a very valuable function, it is desired to remark that in many tools the retainclearance thereon. within the seat during the brazing and har- This makes the tool trated, although sometimes a single wire is l i might be finished at any being thesame from that point on. enables a.rapid-cu tting the same may be dispensed with, and this is particularly true where care is taken to cool the and allow the spelter to set at the ends to prevent the warping of the blades, as I have heretoforeindicated. Where the blades are very short, however, no precaution need be taken to prevent warping at all. After the hardening and brazingthe binding-wires are removed and the flux cleaned ofl, leaving the reamer as seen in Figs. 13 and 14. The projecting ends of the blades are hen ground and thespelter is ground away to clean the metal for the en tire length of the peripheries of the blades, the object of this being toipresenta clean surface forinspection during-thc next step of the process and to properly test the temper Figs. 15 and 1 6. The flutes are next cleaned out;' The front sides of the blades are ground and finished and the shank of the reamer is ground. true to size and finished .1

back of the blades, as seen in Figs. 17 and 18. The reamer is then ground to size, so that the peripheriesof the blades'receive a true finish. (See Figs. 19 and2'0.) The points of the blades are then formed by cutting proper The peripheries of the at the back for relief. free-cutting and completely finishes the same. I f

i I have already indicatedsome changes in the steps of the process and, that some of the steps might be omitted. I will state that the shank of the tool back of the cutting-blade time after the brazing and hardening, whichever happened to blades are beveled be most convenient; also, that the step in which the front of the blades are finished might result in cutting away the stock of the body to the bottom of the blade, particularly where-a smaller number of blades than six is made use 'of, as clearly appears in Figs. 23 and 24,. or on reamers of large diameter, and the other steps subsequent would result in a finished tool, like that appearing in Figs. 23 and 24' of the drawing, the preceding steps This reamer to be formed for cast-iron and provides a sufficient clearance for the removal ofa large amount of metal from the enlargement of a hole and permits a very quick cut for softer metals. I egarding the fourth step referred to, while it is very desirable to retain the metal y slight indentations-and I desireto claim that specificallyI believe that some equivalent means might be employed at this point that might upset and force the metal int-o frictional contact without the necessity of the punch-marks. It would be necessary, however, toemploy some such means as this in order to afford the necessary space for the entry of the spelter or solderto form' the bond, a very slight space only being re 'quired, estimated at. the one-thousandth part of an inch, or'even less. Experience has demonstrated that with care tlns indentation can be continuous, although the in dentation at intervals is desirable.

T Having thus described my improved reamer or milling-tool and the process of manu facturing the same, Idesire to state, as already indicated, that it could be considerably varied in its details without departing om my invention. 1

Having thus described my improved reamer or millin'gtool and the method of manufacturing the same, what I claim as new, and desire to secure by Letters Patent, is-

l. The process of manufacturing a reamer 0r mil-ling tool, consisting of, first, forming the body and. cutting seats therein; second,

placing cutting blades of high-speed or air hardening steel-in said seats and upsetting the metal against the inserted blades; third, arrangingbinding-wires about the blades;

fourth, heating the tool with the bindingwires, toa proper temperature for hardening the blades and applying a suitable spelter to the tool to form a bond between the blades and the said body; fifth, cooling the said .tool by a proper method, beginning atbotli ends of the blades, by an air-blast or by iminersionin oil, or equivalent means, to' contract the bmdmg-wlres and setthe spelter and properly harden the blades, as specified.

2. The process ofimanufacturinga reamer or milling-tool, co sisting of first, forming method, beginning .-at both ends of the blades, by an air-blast or byimniersion in oil, or equivalent means, to set the spelter and properly harden the blades, as specified.

' 3. The process of manufacturing a reamer or millingtool, consisting of first, forming the body and cutting seats therein; second,

placing cutting-bladesof high-speed or airhardening steel-in said seats and upsetting the metal against the inserted blades; third, arranging binding-wires about the blades;

fourth, heating the .tool with the binding-.

wires; to a proper temperature for-hardening the blades and applying a suitable sp'elter to the tool to form' a bond bet-ween the blades and the said body; fifth, cooling the said tool by a proper method, by an air-blast or by nnmerslonin oil or other equivalent means to contract the binding-wires and set the spelter and properly harden the blades, as specified 4. The process of manufacturing a reainer or milling-tool, consisting of first, forming the body and cutting seats therein; second,

placing cutting-blades ofhigh-speed or airhardening steel in said seats and upsetting the metal against. the inserted blades; third,

heating the tool to a proper temperature for hardening the blades and applying a'suitable spelter to the tool to form abond between the blades and the saidbody; fourth, cooling the said tool by a proper method, by an airblast or by immersion, in oil or equivalent means, to set the 'spelter and properly-harden the blades, as specified.

i 5. The process of manufacturing a'reamer .or milling-tool, consisting of first forming the body and cutting seats therein; second, placing cutting-blades of high-speed or airhardenin'gf steel-in said seats; third,- arranging nd'ing-wires about the blades;

fourth, heating the tool, with the bindingwires, to av proper temperature for hardening the. blades and applying a suitable spelter to the tool to form abond between the blades and the said body; fifth,-cooling the" said tool bya proper method, beginning at both ends of the blades, by an air-blast or by iminersion inoil, or'equivalent means, to contract the binding-wires and set the spelter and properly harden the blades, as specified.

. 6. The process of manufacturing a reamer or milling-tool, consisting of first, forming the body and cutting seats therein; second, placing cutting-blades of high-speed or airhar denin steel in' said seats; third, arranging iinding-wires-about the blades; fourth, heating the-tool with thebinding' wires, tea-proper temperature for hardening the blades, and applyin asu'itable spelter to the tool to form abond between the,-blades and the said body; fifth, cooling the said tool by a proper method, by. an air-blast,.,or by immersion in ;oil, or equivalent means, to

"contract thebinding-wires and set the spelter and'properl y harden the blades, as specified.

In witness whereof I have hereunto set my handand seal in thepresencejof two Witnes s'es. r 1 i JOHN GTZIMATTHEWS. [L. s.] Witnesses: P 1

' FRED L. CHArPELL,

.Orrs A.EARL. 

